Hi, My father is having hypertension and chronic kidney disease from last few years.. No dialasys. No other symptoms like swelling, water retention. Urine output was also good till yesterday evening From yesterday night, no urine passed he tried to go to urinate but no urine output from last 6pm...no any feeling of blaader fullness or pain while trying to urinate also no any abnormal symptoms. What may be reason for the same and any medication to take so urine can be passed.